Paper container



March 10, 1936. A ALL 2,033,775

PAPER CONTAINER Filed Feb. 25, 1933 I 1 I/III/III 1/ II 11/ I MMM Patented Mar. 1c, 193

' UNITED: STA ES AT T OFFICE This invention relates to paper containers such as are used for milk, cream, orange juice, and the like, and has for its object to provide a closure which will r'em'ain'tight under all circumstances.

' so ,that when secured in the container in the -manner hereinafter described it for example be used for the larger end of conical containers which, already supplied with an end closure at the smaller end, are filled and then have the improved closure applied to the larger end, and are subsequently to be stored and deliveredwith the smaller end uppermost.

Although hereinafter described particularly for use in connection'with the'seconical containers, it must be understood that the invention is not limited thereto, as the improved closure can be equally well applied in; the manner described to cylindrical paper containers. f

The invention is illustrated in the accompanying drawing, in'which Fig. 1 shows the improvedclosure in position in a conical container before being finally secured therein; Fig.2 shows such closuresecured in position; Fig. 3- a complete container after it has been filled and the closure 5 has been secured, and the container reversed 'to stand on its larger end; and Fig. 4 shows aslightly modified form of closure which can be employed in some,cases In this drawing the thickness of thematerial has been exaggerated to render the arrangement clear.

Referringto Fig. l'it will be seen that the closure I consists of adisc the outer edge of which is, in the position shown in Fig. 1, turned firstdownwardly at,\2 and then upwardlyto form's. flange as at 3, the downward and upwardbends 2 and I being connected by a curved part I and being spaced apart to leave a groove 5 as shown. It is preierredto also raise the central portion I of the closure, as shown in Figs. 1, 2, and 3, for the purpose hereinafter described, but in some cases this may not be necessary and the closure is then formed as shown in Fig. 4.

In applying the improvedclosure to 'a container I such as that shownin Fig. 3, sameis 4s inserted therehi until the curved part 4 at the bottom of the groove comes into contact with a shoulder8 formed oh the inner of the container, and a simple form of crimping tool is employed which as it is advanced first turns in-' 50 wardly and downwardly "theupper edge of the side wall of the container projecting above the upper edge of the gauge 3 of the closure. The continued movement of' the crimping tool turns over the upper edge of flange 3, as at I mm. 2,

55 and at same time forces the upper edge of the side wall of the container down into the groove 5 of the closure, and as the crimping movement progresses such upper edge of the side wall will make contact with the curve 4 at the bottom of groove 5, which will turn it back on itself and direct it upwardlytowards the turned-over edge offiange 3 of the closure, as is clearly shown at" inFig. 2.

It will be seen that the groove 5 of the improved closure has the chest of guiding the material during the crimping operation to form a perfect joint by rolling such materialon itself, which has not hitherto been possible without the employment pf complicated mechanical means. When such means were employed it was necessary to withdraw same on the completion of the opera? result of the absorption of moistureis rather to tighten the closure, the rolled parts of the latter and of the container tending to swell and soto holdth'e parts more securely together, maintaining aperfect Joint. In applying the present invention in connection with conical containers such as that fshownjin Fig. 3, it is generally accept dthat for convenience in transport and storage e should be made with closures of any suitable form already fitted into their smaller ends, and subsequently filled at the larger end with the liquid or other contents for which they are intended, and to which larger end a closure suchv as that described is then applied. V

For, subsequent transport and delivery it is often desirable that such containers should be stood ontheir larger ends, and it is with the object'of taking part of. the weight of the contents that the central portion 6 of the closure is raised as shown in Figs. 1, 2 and 3. In the latter figure the container is shown as standing on its larger end, supported mainly by its intumed edge, but .that the raised central portion 8 is at substantially the sameelevel, so that part of the weight will borne thereby,--especially when the contents consist ofbuttermilk or the like which have a tendency to create a pressure inside the container.

15. tion, and this withdrawal has always tended to In cases where central support for the weight of the contents may not be thought to'be necessary the closure may be made as shown in Fig. 4, without the raised central portion 6.

As-shown in Fig. 1 the flange 3 of the closure is compressed by having been forced into the container, but in practice such flange will be partially opened out or inclined outwardly as shown in Fig. 4, the resilience of such flange due to the presence of the groove 5 enabling it to be inserted into the container without This formation of the closure with groove 5 and outwardly inclined flange 3 is of material advantage, as a number of the closures can be stacked together to occupy comparatively little space, much less than in the case of the flanged closures without groove 5 hitherto used. Further the formation permits of stacking a number of the closures in a magazine for automatic feeding to a fllling andclosuring machine, without a tendency to cause the opening out of the flange.

In applying the improved closures to containers already having closures at their other ends and fllled with the liquid or other contents for which they are intended, it will of course be necessary to first submit the improved closures totreatment with wax or other like agent, but in some cases, as for instance in making cylindrical cmtainers, a closure of the type described can be inserted and crimped in to form the bottom of the container, and the thus completed container sub-.

sequently treated with the wax or other agent, making a very secure joint. After such a container has been filled a waxed closure similar to that described can. be inserted at the other end.

What I claim and desire to secure by patent is:-

A paper container, comprising a tubular body portion provided at one end with a short cylindrical enlargementforminga concave shoulder on the inner face of said body portion, and a closure disc provided with a U-shaped portion forming a groove in the periphery of said disc. the outer wall of said U-shaped disc portion en- Basing said concave shoulder and the inner face of said cylindrical enlargement, the extreme outer mamin of said cylindrical enlargement being folded inwardly upon itself and being bent inwardLv and downwardly over the upwardly extending outer wall of said U-shaped portion of said closure disc to be positioned with its folded margin in the peripheral groove thereof, the marginal portion of the outer wall of said U-shaped disc portion being folded inwardly upon itself and being positioned to face the folded margin of said cylindrical enlargement in said groove, the folded margins of the U-shaped disc portion and cylindricalenlarsement being arranged substantially in alinement with the wall of said tubular body portion. I

CLIFFORD LANCASTER MARSHALL. 

